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    25 April 2020, Volume 36 Issue 4
    Urban Mining Area Transformation Problems and Countermeasures Based on Integration Perspective
    SUN Qi, HUANG Chun-Xiao
    2020, 36(4):  1-6. 
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    The urban mining area has experienced the process of being separated from the independent mining area to be around by the city.Mine-city relationship has changed from the mining area actively independent of the city to the city′s active isolation of the mining area,it will face the reality that the mining area is passively integrated into the city.The internal special historical development process is intrinsic.The mechanism restricts the transformation of mining areas.Taking the Meishan mining area in Nanjing as an example,investigates urban mining areas and employees and analyzes the dilemma of its transformation into the city.It is mainly reflected in five aspects: the destructive of mining,the reuse of facilities,the retention and reuse of facilities,insufficient competitiveness under the influence of employee marginalization characteristics,the decline and strong demand for public service,and the poor redevelopment opportunities under the constraints of historical forms.On this basis,from the perspective of the city,it provides countermeasures for the transformation of urban mining areas into cities,to provide ideas for the transformation of urban mining areas.
    Prospecting Potential and Geological Characteristics of Daxinzhai Pb-Zn Deposit in Yongde County,Yunnan Province
    XIAO Jing-Shan, YU Can, YANG Fan, CHEN Zi-Cong
    2020, 36(4):  11-14. 
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    Daxinzhai Pb-Zn Deposit is located in intersecting section of northeastern edge of Luxi continental and edge of Manghai continental margin,which is distributed in southern margin of Gaoligongshan-Luxi metallogenic sub-belt,and the exploration degree relatively low.Based on the latest prospecting results in the mining area,the regional geological background,geological characteristics of the mining area and deposit geological characteristics are discussed in detail,besides that,the prospecting potential of the area is also studied.The results show that:①the mining area has tectonic development feature,and the occurrence shape and spatial distribution are mainly controlled by faults in NNE direction,NE direction and NW direction,the ore-bodies are mainly hosted in interlayer fissure and silicated alteration zone,which presents veins and cystiform;②the wall-rock alteration are well developed,and the mineralization is closely associated with limonitization and silicification;③the genesis of Daxinzhai Deposit is belongs to hydrothermal filling deposit at ow-medium temperature,the mineralization is dominated by disseminated,dense and massive Pb-Zn deposits.Based on the above analysis results,TDP induced-current middle-gradient and AMT geophysical exploration work are conducted,combing with the working results,it id further show that the favorable prospecting indicators of the mining area can be summarized as altered faults and outcropping sections of quartz sandstone and fine sandstone,besides that,prospecting potential of the depth range of 1 500~1 700 m along the L140 exploration line and L180 exploration line are huge,they are can be taken as the prospecting target areas.
    Metallogenic Regularity and Prospecting Potential of Dahekou Copper Deposit in Dahongshan Mining Area,Central Yunnan Province
    JIN Xin, YU Can
    2020, 36(4):  15-18. 
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    Hekou Copper Deposit is located in southern margin of Kangdian axis,and clamped between Honghe fault and Shuitang-Manbeng-Yuangjiang fault,which characterized by complicated geological structure,magma development and superior metallogenic condition.The regional geological background,geological characteristics of the mine and mineralization law are analyzed,combined with some related geological prospecting results of the mining area.The results show that:①the ore-bodies are mainly occurred in the green schist in Mangganghe Formation (Pt1dm1) and the marble in Feiweihe Formation (Pt1df3),and the typical sedimentary-hydrothermal reformation type ore structures are developed,which including disseminated structure,vein structure and poikilitic structure;②the deposit are strictly controlled by the lithofacies paleogeography,formation,strata,and the ore-bearing strata is usually developed the volcanic eruption-sedimentary rhythm as follows:sodium-variant lava→carbonate→volcanic tuff from up to down in the deposit,with the increasing of deposited material and enrichment of mineralization;③the northern section of deposit has developed the volcanic-sedimentary mineralization,characterized by stable ore-bearing,favorite continuity and large scale.Besides,the southern section has developed the metamorphic hydrothermal-reform mineralizaiton,characterized by complicated morphology of ore-bodies and centralized rich ores.Based on the above analysis results,it is further indicated that the southern Xiyakou area,the occurrence of strata and tectonic in northern section mining area and Tabaqing area can be regard as the favorable further prospecting sections.
    Discovery of Gold Mineralization and Establishment of Minerogenetic Model for Zhazixi Antimony-tungsten Deposit in Hunan Province
    ZHOU Wei-Jiao, LIU Yuan, LU Zhi-Wen
    2020, 36(4):  19-22. 
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    Zhazixi Antimony-tungsten Deposit is located in the middle of xuefeng arc gold-antimony tungsten metallogenic belt.The metallogenic conditions are very favorable Combined with the newly discovery of the gold mineralization characteristics,the deposit characteristics is summarized,and the minerogenetic model is established.The study results show that:①the deposit type is medium-low temperature hydrothermal filling-type Au-Sb-W deposit;②the indosinian period is the main metallogenic age in the area,orogeny product the favorable mineralization structure;③the metallogenic materials of gold and antimony formed by orogenic movement are the mixed sources of crust and mantle,tungsten comes from the surrounding rocks of Wuqiangxi formation;and the source of metallogenic fluid is mainly meteoric water.
    Metallogenic Geological Characteristics and Prospecting Direction of Taohuajian Antimony Ore Deposit in Xianning City, Hubei Province
    LIU Feng, LI Wei, WU Yue-Gang, CAO Wen-Feng
    2020, 36(4):  23-26. 
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    Taohuajian Antimony Deposit is located in the antimony mine field of north Damushan of Xianning,the orebody is produced in the interlayer fracture zone of the Sinian Doushantuo Formation,controlled by two factors stratum and structure.Based on the analysis of the geological and geological characteristics of the mining area,Summary of the genesis of the deposit,it is believed that the mining area and the adjacent Xujiashan antimony deposit belong to the same sedimentary-metamorphic antimony ore.Besides that,the prospecting work of the antimony mine in the area was explored,and three favorable prospects for prospecting are delineated.
    Application of Three-dimensional Scanning Technology for Goaf Detection in Tangdan Copper Mine
    LIU Ming-Jiang, YU Can, WANG De-Wen, ZHU Xue-Feng, ZHAO Wen-Bin
    2020, 36(4):  27-29. 
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    A large number goafs occurred in Tangdan Copper Mine,which characterized by irregularity distribution,complex shape and great security risk caused by the effects of previous garbled mining.In order to obtain the morphology,contour and volume of goaf of the mine,and improve the accuracy and efficiency of stope acceptance measurement,the underground volume of the mine is measured and calculated by adopting 3D laser scanning method instead of traditional measurement method.The three-dimensional geological model of goaf is established based on processing of scanning point-cloud data by using DIMINE software,which can obtain the information of boundary,volume,external morphology and distribution structure of goaf.In addition,the comparison study of scanning results and measured data of mine is done.The results show that the measurement is 0.9%~9.4%,which proved the three-dimensional technology is suitable for the complicated goaf detection.The above study results can provide effectively guarantee for the safety production of Tangdan Copper Mine.
    Geological Characteristics and Prospecting Potential of Songjiapo Copper Deposit in Southern Yunnan Province
    LI Zheng-Zhang
    2020, 36(4):  30-33. 
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    Sonjiapo-Minle Copper Deposit is located in the northwest of Jinggu County,Yunnan Provinc,it is distributed in west side of Zima-Jinggu multiple syncline of Lanping-Simao fold-system,which has the superior metallogenic condition.The founded three mineralized-layers (Ⅰ,Ⅱ,Ⅲ) are occurred in Sonjiapo Formation of Middle Triassic.The ore-hosted rocks are rhyolitic ignimbrite (T2s2λ) and crystal tuff (T2s1λ),and the alteration are closely related to the mineralization,such as potassic-silicification,carbonation,sericitization and silicification-dolomitization.Based on the regional geological characteristics and the above geological working results of the mining area,it is found that the ore-body (mineralization) are mainly controlled by formation lithology,fault and cleavage belt.The lenticular ore and stratiform-like ore are developed in early mineralzation period,and the secondary-leaching bonanza are developed in late stage,by effected tectonic activity,which is belongs to volcanism-subvolcanism-supergene deposit.The sides of fracture and the development area of alteration in Dadutian.Laobatian,Yichang,Huangtian area can be taken as the mineralization enrichment areas.Based on the above discussion results,it if further suggested that some related engineering verification work can be in this mineralization enrichment areas,and strengthening work in the south extendible-portion of No.Ⅲ mineralization zone,the prospecting breakthrough will be realized.
    岩体|地质概况|矿化特征|找矿潜力
    JIN Neng-Qi
    2020, 36(4):  45-47. 
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    Study on the Staggered Distance of the Same Coal Seam and the Layout of the Roadway in the Dadijing Coal Mine
    LI Cheng, LI Ya-Chun, JIANG Zong-Qi
    2020, 36(4):  50-55. 
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    In order to determine the reasonable staggered distance and roadway layout of the close coal seam and the same working face in Dadijing Coal Mine ,the failure characteristics of the upper coal seam to the lower floor after mining are analyzed by using the slip line field theory.Combined with the geological conditions of the coal seam of the mine,the maximum failure depth of the upper coal seam to the floor after mining is 9.35 m.Based on the two kinds of stagger distance theories of pressure stabilizing area and pressure reducing area,the range of staggered distance of the same mining coal seam is obtained.After comparing the factors such as the thickness of the interlayer of the short-distance coal seam and the integrity of the lower coal roof,it is determined that the theory of mining in the pressure reducing area is more reasonable,the minimum stagger distance is 16.75~29.85 m.Through the numerical simulation analysis,the superposition of the stress field of the lower and upper coal pillars and the lower coal seam roadway is found,and the internal staggered layout of the 5-2 coal mining roadway is determined,the internal staggered distance is 6 m.Through theoretical numerical calculation and numerical simulation analysis,the reasonable staggered distance and roadway layout of the same mining face are obtained to guide the production of the mine.
    Study on Large Scale Mining Technology of Top and Bottom Pillar under High Ground Stress in Xincheng Gold Mine
    ZHU Zhao-Wen, GAO Zhen-Ling, FU Qiu-Bo, SU Huan, WANG Jing-Sheng
    2020, 36(4):  56-58. 
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    There are a large number of ores with high grade in the top and bottom pillars of the Ⅴ#orebody -580 m middle section of Xincheng Gold Mine.In order to reduce resource loss and expand the economic needs of enterprises,it is urgent to recover the top and bottom pillars.Considering the geological conditions and high ground stress in -580 m middle section of Xincheng Gold Mine,an upward drift filling mining method with the drift perpendicular to the orebody strike is designed.Starting from the first drift on the uppermost wall of the orebody,the stope is connected with the roadway as the end point,and the stope is retreated along the orebody strike direction.The stope sequence perpendicular to the orebody strike direction is from the upper wall to the lower wall.The stope is arranged along the direction of ore body strike and the direction of artificial false roof is just in a cross shape,so that the area of each artificial false roof exposed in each stope is very small,and the stability of roof can be well maintained after cemented filling.The study and test results show that the large-scale mining of top and bottom pillars of Ⅴ#orebody -580 m middle section is realized,the ore loss rate is about 31.6%,the maximum operation capacity of top pillar mining is 1 300 t.The above study results further show that the mining scheme proposed in this paper is simple and efficient,the efficiency is very high,which can provide reliable reference for the mining operation of the orebodies under the similar geological and mining conditions.
    Numerical Simulation and Test Study on Forming Law of Blasting Crater
    LI 二Bao, YANG Heng, YANG Hai-Tao, LI Chuan-Qi
    2020, 36(4):  59-63. 
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    The high ground stress environment is one of the problems faced by deep mining,particularly high ground stress is closely related to rock blasting in recent years.Taking a copper deposit as the study example,based on the shallow rock blasting theory,the blasting regularity of rock under deep ground stress is studied.Through the comparison analysis of linear charge and concentrated charge blasting funnel forming law with numerical simulation software ANSYS/LSDYNA and the relationship between blasting crater volume and charge depth,it is obtained that under the condition of hole depth deepening gradually,the blasting crater volume of linear charge increased amplitude is larger than concentrated charge,the hole depth when the funnel volume proportional coefficient of concentrated charge blasting reaching the maximum value 1.67 is smaller than that when the maximum value 2.57 of the funnel volume proportional coefficient of linear charge blasting.Through carrying out the linear charge blasting funnel on-site test of horizontal roadway in north mining area,the test results conform to the Livingston crater theory,actual best depth of charge is 0.9 m,which is consistent with the simulation result of 1.2m in the range of allowable error,it further shows that using soft ANSYS/LSDYNA in blasting funnel simulation can guide the field test parameters optimization.At the same time,it is of great significance to study the law of blasting funnel forming for selecting blasting parameters and improving blasting efficiency.
    Comparison and Selection of the Support Scheme of Wellbore of Chentaigou Iron Mine
    ZHOU Zhi-Wei, WANG Zhen, WANG Xin-Li, ZHANG Xiao-Qing
    2020, 36(4):  64-67. 
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    In order to reduce the cost of wellbore support and speed up the construction progress in Chentaigou Iron Mine,the ground stress and surrounding rock mechanics parameters are obtained according to the on-site geostress test and indoor experimental parameters.The theoretical calculations were carried out by using the recommended formula for the wellbore support of the kilometer deep well in the coal industry.Three support schemes which are 300 mm,400 mm plain concrete support and 400 mm reinforced concrete support were proposed.Through simulation analysis,economic analysis and construction speed comparison,the safety factor of 400 mm plain concrete support is 1.23.The support scheme is more suitable for the site.After on-site construction,the wellbore can maintain its own stability,the cost of support is reduced by 1 293 200 yuan,the construction period shortened by 38 d,and the good effects and economic benefits are obtained.Besides that,the scheme is applied to the adjacent auxiliary shaft well support construction,the construction period is shortened by 74 d,and the cost is saved by 4.103 2 million yuan.Therefore,it provides a certain reference for the deep wellbore support below kilometer.
    Design of the High Orepass System in a Phosphate Mine
    SONG Hua, LIU Min, ZHANG Yu-Long
    2020, 36(4):  68-70. 
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    A phosphate mine in Sichuan has the great scale and depth exploitation.If the traditional stage orepass transportation is adopted in the mine,there would be so many orepasses,the transportation process of ore would be excessive and mine management would be very complex.So the system of high orepass and branch orepass was recommended and the layout form and section of high orepass are designed.Besides that,the safe measures for preventing blockage,loading and unloading ore and initial ore drawing are given.After the operation of the designed system of the paper more than one year,the transportation cost is reduced and transportation efficiency is improved,besides that,the system has good reliability,the good foundation of the mine safety production is laid.This is the first successful practice of adopting high orepass and branch orepass drawing system in chemical mine,which has certain reference value for similar mines.
    Study on the Excavation Technique of the Roadway with Broken and Loose Soft Strata in Xishimen Iron Mine
    WANG Guang-De, CUI Jie
    2020, 36(4):  71-74. 
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    The 80 m level north-middle transport roadway in Xishimen Iron Mine is the only way to transport rock from the north mining area to the main system of the mine.The transport roadway is located in the pillar section of Mahe Mine.Due to the influence of mining damage,the deformation of the roadway is serious.Therefore,the mine has to reconstruct a bypass,but it needs to pass through the extremely unstable zone of surrounding rock such as broken and soft rock mass.Based on the support theory of loosening ring,this paper adopts the construction scheme of five combined excavation and support technologies,i.e.guniting reinforcement loosening ring,advanced inserting rod manufacturing artificial roof,artificial micro-vibration excavation,closely following metal arch support and hanging net shotcrete support,to improve the timeliness of surrounding rock support,control the deformation of roadway,ensure smooth passage of bypass,and at the same time,under similar surrounding rock conditions.Tunneling provides a new construction method.
    Optimization Analysis of Step Blasting in an Open-pit Mine
    LI Ming
    2020, 36(4):  75-76. 
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    An open-pit molybdenum mine bench blasting are poor rock-breaking effect,blasting effect is not ideal,large pieces of phenomenon happens,along the wall,foundation,shovel loading efficiency is low,the subsequent grinding equipment efficiency and capacity release,optimum blasting parameters is obtained in this paper,through the BP neural network arithmetic,after the adjustment final hole net parameter and explosive area of 6 m×4 m,and medium difficulty blasting network parameters for 5 m×4 m.Study results show that the optimization of blasting parameters after although before the specific charge is a little increase,but obviously improve the blasting effect,rock from the large rate can be controlled within 2%,basic no root,meet the requirements of mine on the blasting effect,production efficiency is improved,the follow-up production release,relevant broken grinding equipment spare parts replacement cycle extended,energy consumption is reduced,compared to the mine selecting achieved good economic benefit.
    Research Progress of Niobium Tantalum Ore Beneficiation
    WANG Xin, HE Dong-Sheng, LIU Shuang, LIN Fan, DI Yue-Yue
    2020, 36(4):  98-101. 
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    Niobium and tantalum are very important rare and precious metals.China is rich in niobium and tantalum resources,but the low grade,complex paragenetic minerals,and high difficulty in development and utilization lead to the difficulty in niobium and tantalum processing and smelting.At present,niobium and tantalum separation method is mainly gravity separation combined with other processes to improve the roughing efficiency;magnetic separation,gravity separation,electric separation,flotation,chemical separation and other processes are used for cleaning.For fine-grained tantalum and niobium minerals,the flotation process has a better separation effect;for impurity removal of concentrate,the electric separation process has a better separation effect;for low-grade refractory tantalum and niobium ores,the chemical separation process has a better separation effect.
    Progress in Smelting Technology and Application of Ferrosilicon
    ZHANG Zi-Jia, XIA Ling, SONG Shao-Xian
    2020, 36(4):  102-105. 
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    The progress of ferrosilicon smelting technology is summarized from the aspects of ferrosilicon smelting principle and new ferrosilicon smelting technology (including new smelting ore furnace and new smelting raw materials).Introduces the application of ferrosilicon in metallurgical field (can be used as deoxidizer,alloying agent,inoculant,nodularizer,reducing agent,etc.),mineral processing industry,hydrogen production industry,electrode materials for lithium-ion batteries,etc.The future development direction of ferrosilicon is prospected,which provides a reference for the wide application of ferrosilicon.
    Experiment Study on Magnetic Roasting-Separation of Refractory Hematite Limonite
    FANG Qi-Jia
    2020, 36(4):  106-109. 
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    There is 55.88% Fe in a refractory iron ore.Valuable iron minerals mainly exist in the form of hematite and limonite,and gangue minerals are quartz and gibbsite.An innovative technological process consisting of magnetic roasting and magnetic separation was applied to verify the feasibility for treating the ore.The experiment results showed iron concentrate with Fe grade of 63.56% and Fe recovery of 97.18% was obtained under the conditions of raw ore directly drying and scattered(-0.074mm accounted for 53.41%),reduction temperature 540 ℃,concentration of carbon monoxide 40% roasted for 25 min,the roasted product ground to -0.1 mm with magnetic field intensity of 56.7 kA/m.This technological process provide basis for the efficient utilization of refractory hematite limonite.
    Study on Mineral Process Optimization from Qijiaojing Iron Mine In Western Mining Group
    XING Shu-Xin, LI Mei-Xian
    2020, 36(4):  110-112. 
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    In order to solve the problems of concentrate of low iron grade and high SiO2content in Qijiaojing Iron Mine,the optimization of beneficiation process was studied.The results show that: introduction of HPGR technology in crushing stage,and adding wet preconcentration technology before grinding,there are a yield of 11.62% of the coarse tailings can be thrown,the feeding grade of grinding can be increased by 2.89 percentage points,the grinding granularity can be effectively reduced,the grinding amount can be reduced,and the purpose of energy saving and consumption reduction can be achieved;the three-stage grinding is carried out with a tower mill for fine grinding,and then the washing magnetic separator is used for concentration,under the condition of grinding fineness of -0.038 mm accounting for 95%,the iron concentrate with TFe grade of 65.37%,TFe recovery of 72.34% and SiO2content of 4.97% can be obtained.
    Adsorption of Molybdenum in Sulphuric Acid Leaching Solution of Low Grade Molybdenum Oxide Ore by D296 Resin
    DAI Wei, HE Chun-Lin, ZHENG Chun-Hui, WEI Yue-Zhou, LI Jie
    2020, 36(4):  113-117. 
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    In order to understand the effect of D296 resin on the adsorption of molybdenum from the sulfuric acid leach solution of low-grade molybdenum oxide ore,the research of using D296 resin to adsorb molybdenum from the sulfuric acid leach solution of low-grade molybdenum oxide ore with high iron and aluminum concentrations was conducted,and the effect of hydrogen ion concentration,adsorption time and temperature on the selective adsorption of molybdenum by D296 resin;using a mixed solution of 10% ammonia water and 10% ammonium chloride as a desorbent,desorb molybdenum from D296 resin,investigate and understand the adsorption effect of agent volume and desorption time on desorption effect.The results show that the D296 resin has the best selective adsorption effect on molybdenum under the conditions of hydrogen ion concentration of 2 mol/L,adsorption temperature of 50 ℃ and adsorption time of 3 h;desorption with 30 mL desorbent for 10 min The desorption effect of molybdenum is the best.The desorption solution of hydrochloric acid is used to make the iron and aluminum in the desorption solution enter the mother liquor.The molybdenum is precipitated in the form of crystal precipitation and is highly enriched,and the molybdenum in the desorption solution is separated and purified.
    Experiment of Iron Increase and Sulfur Reduce from a High Sulfur Magnetite Concentrate
    HU Bing-Sheng, WANG Xiao-Yu, DING Kai-Zhen
    2020, 36(4):  118-120. 
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    The iron grade of a magnetite concentrate is 56.14%,the content of S is 9.18%,and 95.75% sulfur is in form of pyrrhotite.In order to reach the target of sulfur content <1% in iron concentrate,the experiment of iron increase and sulfur reduction in magnetite concentrate was carried out according to the principle of grinding - low intensity magnetic separation-flotation.The results show that the iron concentrate with Fe grade 67.39% and S content 0.80%,can be obtained by grinding (-0.043 mm 85%)-one roughing one cleaning low intensity magnetic separation for desilicication-one roughing two cleaning reverse flotation desulfurization,also high-iron sulfur concentrate with iron grade of 62.54% and 17.50% can be obtained.Which provides a technical reference for iron increase and sulfur reduction of this kind of high sulfur magnetite concentrate.
    Study on Reverse and Direct Flotation Removed Magnesium and Degrade Silicon for Medium and Low Grade Collophanite in Yunnan
    HUANG Chen-Lei, YANG Xiao, WANG Wen-Yuan, CAI Zhong-Jun, LIU Xing, LUO Hui-Hua, ZHOU Jun
    2020, 36(4):  121-124. 
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    In order to determine the beneficiation process of a low-grade collophanite ore in Yunnan,according to the technological mineralogical characteristics of the phosphate ore and the principle of preferential flotation of easily-selected minerals and less flotation and more suppression,the beneficiation test was carried out by adopting reverse combined direct flotation process.The results show that when the raw ore with P2O5 grade of 25.93%,with grinding fineness of -0.074 mm 80.0%,treated by the process of one roughing one scavenging reverse flotation-concentrate of reverse flotation dehydration-one roughing one cleaning one scavenging direct flotation and medium returned back process.The concentrate with P2O5 grade of 31.30% and recovery of 84.75% is obtained,The MER value of the concentrate is 10.06%,which is 9.04 percentage points lower than the original ore,and the SiO2 content is 15.23%,which is 7.34 percentage points lower than the original ore.The reverse combined direct flotation process is an efficient and simple process to separate low-grade collophanite.
    Magnetic Tail Continuous Selection Experimental Research on the Mine of Tongling Nonferrous Metals Group
    WANG Zhou-He
    2020, 36(4):  125-129. 
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    In order to solve the quality problem of sulfur concentrate after recycling copper (containing gold and silver) and iron in a mine of Tongling Nonferrous Metals Group Holding Co.,Ltd.On the basis of small scale condition test,continuous sulfur selection test was carried out.The results showed that: ①The metal minerals in magnetic separation tailings were mainly pyrite and pyrrhotite,both of which liberation degree was about 90%,and the particle size was mainly distributed in 10~60 μm.Gangue minerals were mainly quartz,followed by calcite,garnet and so on.②The floatability of pyrrhotite was worse than that of pyrite and similar to that of easily floating gangue minerals.It was the reason that it was difficult to obtain high quality sulfur concentrate by flotation process.According to the difference in the floatability of pyrite and pyrrhotite,and the difference in the magnetic properties of pyrrhotite and gangue minerals,the flotation processes of step-selection,middlings by high intensity magnetic separation and high intensity magnetic concentrate by flotation process were adopted.The total sulfur concentrate containing sulfur grade 40.36%,iron grade 49.25%,total sulfur + iron grade 89.61% and sulfur recovery 66.78% was obtained.The iron grade of sulfuric acid burn slag can reach 65% after the concentrate is burnt by sulfuric acid ,which greatly increases the additional value of sulfuric acid burn slag.③Microscopic analysis of the product shows that,the main useful minerals in magnetic separation tailings are pyrite and pyrrhotite.Pyrite is the main metal mineral in sulfur concentrate 1,and pyrrhotite is the main metal mineral in tailings of first-stage concentation and second-stage concentration.Pyrrhotite is the main metal mineral in sulfur concentrate 2.This shows that the flotation processes of staged flotation,middlings by high intensity magnetic separation and high intensity magnetic concentrate via flotation process are reasonable process for recovering pyrite and pyrrhotite from tailings of magnetic separation.④In this continuous separation test,tailings 2 (high intensity magnetic separation tailings) has a high content of sulfur,up to 14.53%.It is mainly non-magnetic pyrite.Follow-up research should be carried out on the recovery of the minerals containing sulfur.
    Study on the Optimization of Atmospheric Desorption Conditions for Gold-bearing Activated Carbon
    YANG Jie, SUN Chang-Gui, SONG Wei, MA Yue-Fei, LI Pei, CAO Zhao
    2020, 36(4):  130-132. 
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    The effects of desorption solution composition,replacement rate and single cycle time on the desorption rate and desorption ratio of gold-bearing activated carbon (abbreviated to Au-bearing AC) were studied through laboratory desorption tests.The results showed that single cycle time was the significant factor for desorption of Au-bearing AC,the desorption rate and desorption ratio could improved dramatically by shorten the single cycle time;Addition of small amount of NaCN could increase the desorption ratio of Au-bearing AC at lower single cycle time,however,the effect of replacement rate was least significant for Au-bearing AC desorption.
    Mineralogy Study on Processed Oxidation Slag of Refractory Gold Ore in Sanhe Gold Industry
    LIU Li-Xin, WANG Shao-Xing, LI Yan-Jun, CHEN Fa-Shang
    2020, 36(4):  133-135. 
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    In order to understand the oxidation degree of the refractory gold oxide slag in Sanhe gold industry,Jiangxi Province,the chemical composition,mineral composition,occurrence state of element and dissemination relationship of inter-mineral were studied by chemical analysis,XRD,laser particle size analysis,optical microscope and energy spectrum analysis.The results show that the intergrowth of gold mineral and pyrite in the oxidation slag is inclusion intergrowth,4.17% of the intergrowth of gold mineral and nonmetallic mineral are inclusions.The total gold content of inclusions is 4.85%,which is an important reason for affecting the leaching rate.
    Study on the Suitable Technological Conditions of Pyrite Flotation
    SUN Xiang-Bin, PENG Hui-Qing
    2020, 36(4):  136-138. 
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    In order to understand the factors affecting the efficient recovery of pyrite,the technological parameters of flotation pulp pH,the type and amount of collector,pulp concentration,ore feeding granularity and flotation time on pure pyrite were investigated.The results show that the flotation recovery of pyrite is 96.1% when pH is 2,SP-1 dosage is 40 mg/L,foaming agent 2# oil dosage is 20 mg/L,pulp concentration is 12%,feeding particle size is 74~26 μm,and flotation time is 4 min.Under the same conditions of other tests,the collective performance the new collector SP-1 developed by the laboratory is obviously better than butyl xanthate.
    Test Study on Cement-waste Rock Filling in Maochang Aluminum Mine
    YU Chao, HOU Guo-Quan
    2020, 36(4):  139-142. 
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    The amount of waste stone produced by a mine is about 90 000 m3/a,and the amount of waste stone that is currently piled up exceeds the design capacity of the waste yard,the cement-waste rock filling method is proposed.Through test study of the cement-waste rock filling material and strength design required for the quarry,the cement-waste filling ratio is obtained,the water-grey ratio was selected as 0.6 and the ash-waste ratio is determined as 0.2.Through industrial test,the strength of the backfilling body can meet the stope mining requirements.Besides that,from the two-step back-picking revealed the effect of filling,the backfilling body has the characteristics of high jacking rate,good stability and homogeneity,which can provide reliable support for the two-step safe mining operation,the recovery rate of the stope is improved more than 15%,the economical benefits are significant,the discharge problem of waste ore of the mine is solved,which is helpful for making full use of waste rock and realizing the goal of non-waste mining.
    Test Study on the Law of Dense Settlement of Full Tailings
    WU He-Ping, CAO Wan-Bao, ZHANG Chun-Peng
    2020, 36(4):  143-147. 
    Asbtract ( 1022 )  
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    Aiming at the problems of fine particles and difficult settlement concentration of full tailings in a metal mine,taking the solid flux and underflow concentration as measurement indexes,the flocculation and settlement law of full tailings is studied by carrying out the physical properties of full tailings,static concentration test and dynamic concentration test,so as to determine the suitable feed concentration of the mine thickener,the flocculant type and dosage.The test results show that the suitable feeding speed of the full tailings thickening is 0.53~0.83 t/(m2•h),the LB1530 anionic flocculant is selected,the dosage of flocculant is 15 g/t,and the dilution concentration of pulp is about 11%.Meanwhile,it also shows that dehydration of full tailings can be realized by using deep cone thickener,which can realize the paste discharge,so as to achieve the goal of the safe,efficient and economic mining.
    Optimization and Upgrading of Antifreeze Spraying System in Quick Quantitative Loading Station
    SU Zheng-You
    2020, 36(4):  148-150. 
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    In order to solve the problem of freezing of fine coal transportation in winter and the difficulty of coal unloading caused by the bond of fine coal on the inner wall of the carriage,it is necessary to evenly spray antifreeze on the inner wall and bottom of the carriage body before loading the carriage.And when the fine coal enters the buffer warehouse,the antifreeze is sprayed into the coal flow.In order to save the antifreeze,it is required to stop spraying at the interval between the two cars.By upgrading the anti-freeze liquid system,automatic control is realized between the car spraying and the coal flow spraying in the buffer tank,which solves the problem of environmental pollution caused by the non-stop spraying between the two cars,and saves manpower and a large amount of anti-freeze liquid.In the design and component selection,the bad conditions such as cold environment and wind direction are fully considered,so that the system can work reliably.
    Failure Mechanism Analysis and Control Technology of Argillaceous Soft Rock Roadway
    LIU Ning, WANG Shao-Yong, ZHOU Fa-Lu, WEI Hai-Tao, XIA De-Wei, ZHANG Xiao-Gang
    2020, 36(4):  161-164. 
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    The rock mass of Baishitamu Copper Mine in Xinjiang is soft and argillaceous,the roadway is prone to damage such as rib spalling and floor heave,the repair rate is as high as 70%.In order to realize safe and efficient support of soft rock roadway,roadway failure forms were investigated and analyzed,the mechanical parameters and hydrologic properties of roadway rock mass were tested,the failure mechanism of argillaceous soft rock roadway was revealed,a new active directional support method with resin bolt,steel mesh and shotcrete was adopted.Considering surrounding rock quality,roadway section,stress environment and service life of roadway,the zoning,grading and time-sharing support scheme for the broken soft rock roadway of Baishtamu Copper Mine was formed.The actual application results show that the roadway deformation is reduced by 20% and the deformation rate is reduced from 3.3 mm/d to 0.6 mm/d by using new support scheme.The repair cost is greatly reduced,and the roadway excavation cost is reduced by 14%,the economical benefits are significant.The above study results further indicate that the zoning,grading and time-sharing support scheme proposed in Baishtamu Copper Mine in this paper could help for improving the roadway stability,reducing the roadway repair costs and guaranteeing the safety production of the mine.
    Analysis of the Influence of Waist Width of Hexagonal Access on the Stability of Filling Body in Longshou Mine
    WANG Hu
    2020, 36(4):  165-170. 
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    In order to promote mining efficiency and reduce mining cost under the premise of ensuring safety of production,based on the actual situation of Longshou Mine,by using ANSYS finite element 3D simulation software,the 3D model of hexagon access in Longshou Mine is established.The influence of waist width of the four hexagonal accesses with the parameters of 4 m×4 m×5 m(rectangular access),4 m×5 m×5 m,4 m×6 m×5 m,4 m×7 m×5 m on the stability of α access of backfilling body is studied.The results show that the waist width has a significant effect on the maximum principal stress,minimum principal stress and overall displacement of different shapes of accesses,especially for the rectangular access,compared with the other 3 sets of hexagonal accesses,the maximum principal stress,minimum principal stress and maximum displacement are 3 times,14 times and 30 times different from the maximum and minimum values.However,the waist width of the access has little influence on the access specifications of the same shape,and the difference between the maximum and minimum values in the three aspects of the study is 1.40 times,3.48 times and 22.75 times.In general,with the increasing of waist with of the access,the rectangular access with 4 m waist width will greatly affects the stability of the backfilling body.The hexagon access with 5~7 m waist width has little influence on the stability of backfilling body.In the actual production,only partial support and management are needed for α access of backfilling body,the good production effects would be achieved.The above study results provide a basis for the further discussion of the mining methods and the stability of backfilling body access.
    Safety Risk Analysis of Open pit Mine Based on Fuzzy Analytic Hierarchy Process
    GU Ming, HAO Zhen-Li, TAO Zhi-Gang, JIN Kun, ZHAO Dong-Dong
    2020, 36(4):  171-174. 
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    In open-pit mining,accidents occur frequently and have serious consequences,bringing a great threat to works and property safety.As a result,for mining enterprises not only increases the cost of production and delays the production schedules.Combined with engineering example,this article aims to study the exploitation phase which is prone to accidents,meanwhile,based on the theory of fuzzy hierarchy analysis,this article will analysis on the affect factors of safety work in the mining stage,which uses MATLAB software to calculate,to assess the risk of the open pit in the mining stage.Finally the risk assessment system will be established.The results can provide important reference for the safe mining of open mines.
    Research and Application of Dust Prevention Technology in Coal Mine
    TIAN Wei-Ning, ZHANG Shi-Yue, JIA Bao-Shan, JING De-Ji
    2020, 36(4):  175-178. 
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    Among the many disasters that affecting coal mine safety production,coal mine dust has the most serious impact on mine production and workers'health.Therefore,protecting the physical and mental health of employees and ensuring the safety of mine production is the top priority of coal mine dust prevention technology.Introduces the research status of coal mine dust generation,characteristics and hazards,and expounds the research status of coal mine dust prevention technology.The development and application of spray dust reduction technology are analyzed with magnetized water spray dust reduction and charged spray dust reduction as main contents.It provides reference for the treatment of coal mine dust.
    Overview of Safety Facilities Design for a Limestone Mine
    HUANG Ru-Jie
    2020, 36(4):  179-185. 
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    After a limestone mine has completed the preliminary design of a new mine project,it lacks a "safety facility design" (ie,a "safety section").In order to ensure the smooth progress of the new mine project site,in accordance with the requirements of relevant national and local codes,regulations and management regulations,on the basis of an overview of the mine's geology and design profile,the safety countermeasures and recommendations are implemented in detail and safety facilities The design,safety management,investment in special safety facilities,existing problems and suggestions,etc.,are the preliminary design of the mine which fully reflects the relevant national design requirements and promotes the smooth implementation of the project.At present,the project implementation progress is good.
    Evaluation and Analysis of Heavy Metal Pollution in Abandoned Lead-zinc Mine
    XIA Ming-Qiang, PAN Lei, GUO Fu-Qiang
    2020, 36(4):  233-237. 
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    Abandoned lead-zinc mines are spread all over the country.Although the mining and utilization of lead-zinc minerals has brought a lot of material wealth,it has also affected the ecological environment.Inducing geological disasters such as subsidence.This article analyzes and investigates heavy metal pollution in abandoned lead-zinc mines in order to achieve the effect of treatment and rehabilitation of abandoned lead-zinc mines.Plants have the function of accumulating or accumulating heavy metals.Many studies have investigated plants growing in lead-zinc mines to find plants that repair heavy metal pollution in the mines.Based on comprehensive research,plants that have a good enrichment effect on heavy metals in lead-zinc mines include pteridophyta yarrow,pennisetum,miscanthus,annual wing,small flying awn,and full-leaf maran,dandelion,it is concluded that the small flying canopy,horsetail,and yarrow can effectively absorb heavy metals.Taking Qingyuan County's abandoned lead-zinc mine area as an example,heavy metal pollution evaluation is conducted and the coresponding treatment measures of the abandoned lead-zinc mine are proposed so as to provide some reliable for the evaluation and treatment of heavy metal pollution in abandoned mines.
    Evaluation of Heavy Metal Characteristics of Soil and Dominant Plants in Qingyuan Pb-Zn Mining Area
    XU Xuan-Mei, YE Wu, ZHU Hua-Cang, YU Jiu-Hua, WU Yuan-Hai, ZHONG Xiao-Yu, HE Xian-Hui
    2020, 36(4):  238-241. 
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    In order to study the heavy metal pollution situation in Qingyuan Pb-Zn mining area,Zhejiang Province,and select the dominant plants for remediation of heavy metal pollution in the soil,based on the determination of heavy metal content in different parts of the soil and plants in the mine,the pollution of heavy metal elements and the correlation among the elements were analyzed,and the potential ecological harm degree of heavy metals was evaluated.The results show that the soil is heavily polluted by Pb and Cr,Pb and Cd are extremely strong ecologi-cal risks,Cu is slight to medium risks,Zn is slight risks,and the comprehensive potential ecological risks of the five evaluation areas are extremely strong;Pinus massoniana has a strong tolerance to heavy metals,which can be used as one of the pioneer tree species .